updated source

developer-basics/source.md

@@ -2,11 +2,16 @@
 
 <p class="uk-article-lead">When building Pagekit extensions, you can totally rely on a Pagekit installation from one of the release packages available at [pagekit.com](https://www.pagekit.com/download) or [from Github](https://github.com/pagekit/pagekit/releases).</p>
 
-However, if you always want stay up to date with the current development version, you can install Pagekit from the source available on Github. This article explains which steps you need to take.
+However, if you always want stay up to date with the current development version, you can install Pagekit from the source available on Github. This article explains, which steps you need to take.
 
-## Checkout and install
+<ul class="uk-list">
+    <li><a href="#check-out-and-install">Check out and install</a></li>
+    <li><a href="#stay-up-to-date">Stay up to date</a></li>
+</ul>
 
-Make sure you have [Composer](https://getcomposer.org/doc/00-intro.md#installation-nix) and [npm](https://www.npmjs.com/) installed.
+## Check out and install
+
+Make sure that [Composer](https://getcomposer.org/doc/00-intro.md#installation-nix) and [npm](https://www.npmjs.com/) are installed.
 
 Clone the repository.
 
@@ -32,7 +37,7 @@ To watch for JS module changes, run `webpack --watch`.
 
 When the installer has finished, point your browser to the Pagekit URL on your web server and follow the installer.
 
-When you have a running Pagekit installation, use the Pagekit CLI to fetch translations. Without, the interface will appear in English only.
+When you have a running Pagekit installation, use the Pagekit CLI to fetch translations. Without that, the interface will appear in English only.
 
 ```
 php pagekit translation:fetch